Workers at Chevron's Wheatstone project in Western Australia say they bunked down on bits of cardboard or the concrete floor when Tropical Cyclone Olwyn came through, and the company faces a "mutiny" over treatment of employees at its Barrow Island site.

Coastal communities in WA's Pilbara remain on red alert as Tropical Cyclone Olwyn tracks close to the upper West Australian coast, bringing destructive wind gusts and heavy rainfall to the Northwest Cape.